precede vs preexist

precede

verb
  • To cause to be preceded; to preface; to introduce. 

  • To have higher rank than (someone or something else). 

  • To go before, go in front of. 

noun
  • Brief editorial preface (usually to an article or essay) 

preexist

verb
  • To exist before something else. 

How often have the words precede and preexist occurred in a corpus of books? (source: Google Ngram Viewer )